Spain has one of the highest FTTx rollouts in Europe though. My theory is that they just prioritized building fiber and there was no money left for ipv6 transition.
Except that is completely wrong. Consumer/residential networks have significantly higher ipv6 adoption rates that corporate/enterprise networks. That is why you see such clear patterns (weekend vs weekday) in the adoption graphs.
Those are still per-customer and require you to dedicate an entire IP address to it. That's overkill for a server which mostly talks over ipv6 but needs to connect to an ipv4-only service like Github once in a blue moon.
30 USD/month and 0.045 USD/GB for ingress it is ok if you are big. It is a cheap service to build yourself. I do feel the pain of it being hard to get IPv4 minimal connectivity on ipv6 only hosts, i.e. for me a 1 USD/GB would be fine.
My prediction is that sites will be half-IPv6 only; backends will be IPv6 and IPv4 traffic will get proxied to IPv6 by CDNs / edge LBs. I think CloudFront for example supports that scenario, avoiding IPv4 costs (in theory).
I doubt it honestly. Most people are connecting to sites like Youtube, Instagram etc., which do actually support IPv6.
It's how I get 60~80% IPv6 traffic on my home network. A great portion of it was because of my mom watching Youtube.
Even when you discount the services run by FAANG, for personal sites, Cloudflare and GitHub Pages (but surprisingly, not GitHub itself) support IPv6 and enable IPv6 support by default.
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